In a future where mysterious three-legged machines called Tripods rule humanity, thirteen-year-old Will Parker lives in a peaceful English village. Everyone accepts their fate of being 'Capped' at age fourteen—a ceremony that removes curiosity and rebellion. But when Will meets a mysterious wanderer who still has free will, he learns the terrifying truth: the Capping makes people obedient slaves to the alien Tripods. Will must make a dangerous choice: accept a safe, controlled life or embark on a perilous journey to join a rumored band of free humans in the White Mountains.